CN210608527U - Lightning surge prevention and insulation voltage resistance circuit and power supply - Google Patents
Lightning surge prevention and insulation voltage resistance circuit and power supply Download PDFInfo
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- CN210608527U CN210608527U CN201921558333.0U CN201921558333U CN210608527U CN 210608527 U CN210608527 U CN 210608527U CN 201921558333 U CN201921558333 U CN 201921558333U CN 210608527 U CN210608527 U CN 210608527U
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Abstract
The utility model relates to a surge and withstand voltage circuit and power are hit in lightning protection, include: the first protection circuit is respectively connected with a live wire and a zero line and clamps surge signals generated by lightning strike at a first clamping voltage when the alternating current input end is struck by the lightning; the second protection circuit is respectively connected with the live wire and the zero wire; the bleeder circuit is connected with the second protection circuit and the bleeder circuit is arranged in parallel with the bleeder circuit; when the alternating current input end of the second protection circuit, the bleeder circuit and the bleeder circuit is struck by lightning, surge signals generated by the lightning stroke are discharged to the ground, and when the bleeder circuit carries out voltage withstand test on the alternating current input end, voltage input by the alternating current input end is divided, so that the impedance at the two ends of the bleeder circuit is the same as the impedance of the second protection circuit. The circuit can simultaneously meet the lightning protection effect and the insulation withstand voltage test, and has the advantages of low cost, good effect, high reliability and effectively reduced load damage probability.
Description
Technical Field
The utility model relates to a power technical field, more specifically say, relate to a surge and withstand voltage circuit and power are hit in lightning protection.
Background
Along with the rapid development of LED illumination, the original isolation LED power supply can not meet the application requirements of the market, the non-isolation power supply with high cost performance is favored, customers pay attention to the safety and anti-interference capability of the non-isolation power supply product, the safety requirement of the product and the requirements on protection capabilities such as lightning surge resistance are continuously improved, the lightning surge resistance protection of the non-isolation power supply is the same as the performance of the isolation power supply, and a better protection circuit is required for the power supply part and the LED light source part. However, in the existing design scheme, the piezoresistor and the gas discharge tube are adopted in the EMI circuit of the power supply for discharging, the effect on common-mode lightning surge is not ideal, the common-mode residual voltage transmitted to the lamp at the output end is often very high, and the LED light source of the lamp is directly broken down and burnt down in severe cases. The suppression of lightning surge common mode residual voltage of a non-isolated power supply in the industry at present can be realized by more than 4KV, the insulation grade of the existing lamp is below 2KV, the existing lamp is weak, and the whole lamp cannot normally work due to the fact that no lightning protection and surge device is provided.
The design scheme of the common-mode lightning protection circuit in the traditional application is that a common-mode absorption circuit is added in an EMI circuit, a piezoresistor is generally adopted in a lightning surge protection circuit to be connected in series with a large-size gas discharge tube for discharging, although a certain lightning stroke suppression effect is achieved, the clamping voltage is high (a detonator with the voltage higher than 2 KV), so that the residual voltage to the rear end is also high, the damage to electronic elements at the rear end is large, and the reliability of a product is greatly reduced. However, if the specification of the series gas discharge tube is changed to be small (2KV detonator), the lightning stroke is well inhibited, and the withstand voltage test is poor.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a lightning protection surge and withstand voltage circuit and power are provided.
The utility model provides a technical scheme that its technical problem adopted is: provided is a surge and dielectric withstand voltage protection circuit, including:
the first protection circuit is respectively connected with a live wire and a zero line and clamps surge signals generated by lightning strike at a first clamping voltage when the alternating current input end is struck by the lightning;
the second protection circuit is respectively connected with the live wire and the zero wire;
the bleeder circuit is connected with the second protection circuit, and the bleeder circuit is connected with the bleeder circuit in parallel;
the second protection circuit, the bleeder circuit and the bleeder circuit are in when the alternating current input end encounters lightning, the surge signal generated by the lightning stroke is discharged to the ground, and the bleeder circuit is in when the alternating current input end carries out withstand voltage test, the voltage input by the alternating current input end is divided, so that the impedance at the two ends of the bleeder circuit is the same as the impedance of the second protection circuit.
In one embodiment, the first guard circuit includes: a first voltage dependent resistor;
the first end of the first piezoresistor is connected with the live wire, and the second end of the first piezoresistor is connected with the zero wire.
In one embodiment, the second guard circuit includes: a second and a third piezo-resistor;
the first end of the second piezoresistor is connected with the zero line, the second end of the second piezoresistor is connected with the first end of the bleeder circuit, the first end of the third piezoresistor is connected with the live wire, and the second end of the third piezoresistor is connected with the first end of the bleeder circuit and the first end of the bleeder circuit.
In one embodiment, the bleeding circuit includes: a discharge tube;
the first end of the discharge tube is connected with the second end of the second voltage dependent resistor and the second end of the third voltage dependent resistor, and the second end of the discharge tube is connected with the ground wire.
In one embodiment, the bleeding circuit includes: m discharge tubes; m is an integer greater than 1;
the M discharge tubes are connected in series, a first end of a first discharge tube in the M discharge tubes is connected with a second end of the second voltage dependent resistor and a second end of the third voltage dependent resistor, and a second end of an Mth discharge tube in the M discharge tubes is connected with the ground wire.
In one embodiment, the voltage divider circuit includes: a resistance;
a first end of the resistor is connected to a first end of the one discharge tube, and a second end of the resistor is connected to a second end of the one discharge tube and to the ground.
In one embodiment, a first end of the resistor is connected to a first end of the first discharge tube, and a second end of the resistor is connected to a second end of the mth discharge tube and to the ground.
In one embodiment, the resistance of the resistor satisfies:
wherein Z isR1Is the impedance of a resistor, VinVoltage, V, input from AC input terminal for withstand voltage testMOV2/MOV3Is the voltage across the second or third varistor, IdMOV2Is the maximum leakage current of the second varistor, IdMOV3Is the maximum leakage current of the third varistor.
In one embodiment, the one discharge tube and the M discharge tubes are both gas discharge tubes.
The utility model also provides a power, a serial communication port, including above lightning protection surge and withstand voltage circuit.
Implement the utility model discloses a surge and withstand voltage circuit are hit in lightning protection has following beneficial effect: by adopting the lightning surge and voltage withstand insulation circuit, under the condition of not increasing the cost, the lightning surge signal generated by lightning can be effectively inhibited and absorbed when the circuit is struck by lightning, the voltage withstand insulation test can be met, the lightning surge and voltage withstand insulation effect is very good, the reliability is higher, the residual voltage transmitted to a rear-stage circuit is effectively reduced, and the damage probability of a load is effectively reduced.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a surge and dielectric withstand voltage protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a first embodiment of the surge and dielectric withstand voltage protection circuit provided by the present invention;
fig. 3 is a schematic circuit diagram of a second embodiment of the surge and dielectric withstand voltage protection circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a schematic block diagram of a surge and dielectric withstand voltage protection circuit according to an embodiment of the present invention is provided, and the surge and dielectric withstand voltage protection circuit can be applied to a power supply device, including but not limited to a power supply device (such as an LED driving power supply, etc.) of a lighting fixture, an industrial power supply device, a communication power supply device, etc. The lightning protection surge and voltage withstand test circuit is arranged in the power supply device, so that the power supply device can be ensured to meet the action of the lightning protection surge, lightning surge signals can be effectively restrained and absorbed, the voltage withstand test can be simultaneously met, the voltage withstand test effect is good, and the problem of poor voltage withstand test cannot exist. In addition, the lightning surge and insulation voltage-resistant circuit does not need to increase extra cost, has high reliability, and can effectively reduce the residual voltage of the output end of the power supply device and effectively reduce the damage probability of the load when the power supply device is struck by lightning.
Specifically, as shown in fig. 1, the surge and dielectric withstand voltage preventing circuit includes: a first guard circuit 12, a second guard circuit 13, a bleeder circuit 14 and a voltage divider circuit 15.
The embodiment of the utility model provides an in, first protection circuit 12 connects live wire and zero line respectively, is located first clamp voltage with the surge signal pincers that the thunderbolt produced when alternating current input end (live wire and zero line promptly) meets with the thunderbolt. The first protection circuit 12 is mainly used for conducting when a surge signal generated when the ac input terminal is struck by lightning is a differential mode signal, so as to position a voltage clamp of the surge signal at a first clamping voltage. It should be noted that the first clamp voltage is a threshold voltage of the first protection circuit 12. It can be understood that, when a lightning strike occurs, if the generated surge signal is a differential mode signal, the high voltage of the surge signal can be effectively suppressed and absorbed by the clamping effect of the first protection circuit 12, so as to reduce the voltage entering the post-stage circuit (such as a driving circuit), thereby effectively reducing the residual voltage transmitted to the output end, reducing the influence of the surge signal on the load, and reducing the damage probability of the load.
Alternatively, the first protection circuit 12 may be implemented by a voltage dependent resistor, wherein the number of voltage dependent resistors is not limited in the present invention. When a plurality of piezoresistors are adopted, the piezoresistors can be connected in series or in parallel, and the utility model discloses do not make concrete requirements. In addition, the piezoresistors employed include, but are not limited to, at least one of zinc oxide piezoresistors, silicon carbide piezoresistors, metal oxide piezoresistors, germanium (silicon) piezoresistors, barium titanate piezoresistors.
The embodiment of the utility model provides an in, second protection circuit 13 is connected with live wire and zero line respectively for switch on when alternating current input end meets with the produced surge signal of thunderbolt for common mode signal, lie in second clamper voltage with produced surge signal's voltage clamp.
Alternatively, the second protection circuit 13 may be implemented by a voltage dependent resistor, wherein the number and connection mode (serial connection or parallel connection) of the voltage dependent resistors are not limited in this disclosure. The piezoresistors used include, but are not limited to, at least one of zinc oxide piezoresistors, silicon carbide piezoresistors, metal oxide piezoresistors, germanium (silicon) piezoresistors, barium titanate piezoresistors.
The embodiment of the utility model provides an in, bleeder circuit 14 is connected with second protection circuit 13 for switch on when alternating current input end meets with the produced surge signal of thunderbolt for common mode signal, so as to discharge to the earth through second protection circuit 13 absorption back remaining voltage fast, effectively reduce the voltage that gets into drive circuit, thereby effectively reduce the residual pressure that conveys to the output, in order to reduce the influence of surge signal to the load, reduce the damage probability of load.
Alternatively, the bleeder circuit 14 may be implemented by a gas discharge tube, wherein the gas discharge tube may be one or more. When a plurality of gas discharge tubes are adopted, the gas discharge tubes are connected in series and then connected between the second protection circuit 13 and the ground, so that the generated common-mode signal is quickly released to the ground when the lightning strike occurs, the residual voltage of the input load is reduced, and the load is prevented from being damaged by the lightning strike.
In the embodiment of the present invention, the voltage dividing circuit 15 is connected in parallel with the bleeding circuit 14. The voltage dividing circuit 15 is arranged in parallel at two ends of the bleeder circuit 14, so that the voltage dividing effect can be achieved, when the insulation withstand voltage test is carried out, the voltage input by the alternating current input end is divided, and the impedance at two ends of the bleeder circuit 14 is the same as the impedance of the second protection circuit 13.
Specifically, when the withstand voltage test is performed, because the gas discharge tube in the bleeder circuit 14 is in an off state (OPEN state), when the ac input terminal is subjected to withstand voltage, a situation of uneven voltage division may occur, at this time, all the voltages input at the ac input terminal may be applied to the gas discharge tube in the bleeder circuit 14, and when the gas discharge tube in the bleeder circuit 14 adopts a specification of not more than 2KV, the gas discharge tube is very easily triggered, which causes a poor withstand voltage test, and the withstand voltage test cannot pass. The utility model discloses a bleeder circuit 15 is parallelly connected at bleeder circuit 14 both ends, can be so that the impedance of the gas discharge tube in bleeder circuit 14 and second protection circuit 13's impedance are in same rank (if all be M ohm level), at this moment, when carrying out withstand voltage test, because the gas discharge tube in second protection circuit 13 and bleeder circuit 14 all has the impedance, the voltage of AC input end input will be divided, and then reduce the voltage that gas discharge tube divides on the income, thereby avoid gas discharge tube to be triggered by mistake, make the withstand voltage test of insulation can pass through. The voltage dividing circuit 15 is required to make the voltage divided by the gas discharge tube in the bleeder circuit 14 be lower than 2KV when the gas discharge tube is subjected to the withstand voltage test.
Optionally, the voltage dividing circuit 15 may be implemented by capacitors or resistors, where the number of the capacitors may be one or more, and when a plurality of capacitors are used, the plurality of capacitors may be connected in parallel with the bleeding circuit 14 after forming a series capacitor bank (a plurality of capacitors are connected in series). Similarly, the number of the resistors may also be one or more, and when a plurality of resistors are adopted, the plurality of resistors may be first formed into a series resistor group (a plurality of resistors are connected in series) and then arranged in parallel with the bleeding circuit 14.
Further, the lightning surge and dielectric withstand voltage protection circuit further comprises: and the safety circuit 11 is arranged on the fire line and used for absorbing voltage and current in a surge signal generated by lightning stroke. Optionally, the safety circuit 11 may include: and a fuse.
The specific principle of the surge and dielectric withstand voltage circuit according to the present invention will be described below with reference to several preferred embodiments.
Referring to fig. 2, it is a schematic circuit diagram of a first embodiment of the surge and dielectric breakdown protection circuit according to the present invention.
As shown in fig. 2, the fuse circuit 11 includes: fuse F1. The first guard circuit 12 includes: a first piezo-resistor MOV 1. The second guard circuit 13 includes: a second varistor MOV2 and a third varistor MOV 3. The bleeding circuit 14 includes: a discharge tube FDG. The voltage dividing circuit 15 includes: resistor R1.
As shown in fig. 2, a first terminal of the first varistor MOV1 is connected to hot wire and a second terminal of the first varistor MOV1 is connected to neutral wire. Further, as shown in fig. 2, in this embodiment, the first terminal of the first varistor MOV1 may be connected to the hot wire through a fuse F1. That is, the live line is first connected to the first terminal of the fuse F1, the second terminal of the fuse F1 is connected to the first terminal of the first varistor MOV1, and the second terminal of the fuse F1 is further connected to the first input terminal of the driving circuit.
A first terminal of the second varistor MOV2 is connected to the neutral line, a second terminal of the second varistor MOV2 is connected to a first terminal of the bleeder circuit 14 (i.e., a first terminal of the discharge tube FDG), a first terminal of the third varistor MOV3 is connected to the live line (i.e., a first terminal of the third varistor MOV3 is connected to a second terminal of the fuse F1 as shown in fig. 2), and a second terminal of the third varistor MOV3 is connected to a first terminal of the bleeder circuit 14 and a first terminal of the voltage divider circuit 15 (i.e., a first terminal of the resistor R1 as shown in fig. 2).
Further, as shown in fig. 2, a first terminal of a discharge tube FDG is connected to the second terminal of the second varistor MOV2 and the second terminal of the third varistor MOV3, and a second terminal of the discharge tube FDG is connected to the ground. A first terminal of the resistor R1 is connected to a first terminal of a discharge tube FDG, and a second terminal of the resistor R1 is connected to a second terminal of the discharge tube FDG and to ground. The second input terminal of the driving circuit is connected to the neutral line, and the output terminal of the driving circuit is connected to a load (the load is not shown in fig. 2).
As shown in fig. 2, when the surge signal generated by a lightning strike on the L-line (live line)/N-line (neutral line) is a differential mode signal, the first varistor MOV1 is turned on and the voltage clamp of the differential mode signal is at the first clamping voltage. When the surge signal generated by the lightning strike on the L line/N line is a common-mode signal, if the common-mode signal is input from the L line, the third varistor MOV3 is conducted, the voltage clamp of the common-mode signal is positioned at the threshold voltage of the common-mode signal, the discharge tube FDG is conducted, the residual voltage absorbed by the third varistor MOV3 is quickly discharged to the ground, the residual voltage at the output end of the driving circuit is reduced, and the lightning strike residual voltage entering the load is further reduced. If a common-mode signal is input from an N line, the second piezoresistor MOV2 is conducted, a voltage clamp of the common-mode signal is positioned at the threshold voltage, the discharge tube FDG is conducted, and the residual voltage absorbed by the second piezoresistor MOV2 is quickly discharged to the ground, so that the residual voltage at the output end of the driving circuit is reduced, the lightning residual voltage entering a load is effectively reduced, and the damage probability of the load is reduced. It should be noted that the threshold voltage of the second varistor MOV2 and the threshold voltage of the third varistor MOV3 are the second clamping voltage of the second protection circuit 13.
In the insulation voltage withstand test, the L line and the N line are firstly shorted together, when the insulation voltage withstand test is started, the second varistor MOV2 and the third varistor MOV3 are connected in parallel, the resistor R1 and the second varistor MOV2 and the third varistor MOV3 which are connected in parallel form a series mode, at this time, the voltage at the input end passes through the second varistor MOV2 and the third varistor MOV3 which are connected in parallel, then passes through the resistor R1, finally reaches the ground, and further the voltage at the input end is divided by the resistor R1, because the resistor R1 is connected in parallel at the two ends of the FDG, the voltage at the input end is divided by the resistor R1, so that the two ends of the FDG also have impedance, and in order to ensure that the insulation voltage withstand test passes, the impedance of the resistor R1 needs to satisfy:
wherein Z isR1Is the impedance of the resistor R1, VinVoltage, V, input from AC input terminal for withstand voltage testMOV2/MOV3Is the voltage across the second varistor MOV2 or the third varistor MOV3, IdMOV2Is the maximum leakage current, I, of the second varistor MOV2dMOV3Is the maximum leakage current of the third varistor MOV 3.
At this time, the impedance across the discharge tube FDG is equivalent to the impedance of the resistor R1, that is:
wherein Z isFDGIs the impedance of the discharge vessel.
Because the impedance of the second varistor MOV2 and the third varistor MOV3 is above M omega, and the discharge tube FDG is in an OPEN state (OPEN state), voltage division is uneven when a withstand voltage test is carried out, the voltage of an input end is completely added on the discharge tube FDG, and the discharge tube FDG is easily triggered when the specification of the discharge tube FDG is less than or equal to 2KV, so that poor withstand voltage is caused. When we connect the resistor R1 in parallel beside the discharge tube FDG and the resistor R1 satisfies the condition (formula 1), the impedance of the discharge tube FDG can be above M Ω, at this time, when testing the withstand voltage, because the second varistor MOV2 and the third varistor MOV3 have impedance with the discharge tube FDG, the voltage will be divided, and further the voltage across the discharge tube FDG is:
VFDG＝Vin-VMOV2/MOV3＜VFDG general(2 formula).
Wherein, VFDGVoltage, V, across the discharge tube FDG for withstand voltage testingFDG generalIs the on voltage of the discharge tube FDG. It can be seen from formula (2) that, when the withstand voltage test is performed, the voltage at the two ends of the discharge tube FDG is smaller than the conduction voltage thereof, so that the discharge tube FDG cannot be triggered by mistake, thereby effectively ensuring that the withstand voltage test is passed and the withstand voltage test is good.
Referring to fig. 3, it is a schematic circuit diagram of a second embodiment of the surge and dielectric withstand voltage protection circuit according to the present invention.
The difference between this embodiment and the first embodiment is: the bleeding circuit 14 includes: m discharge tubes; m is an integer greater than 1.
The M discharge tubes are connected in series and a first end of a first discharge tube FDG1 of the M discharge tubes is connected to a second end of the second varistor MOV2 and a second end of the third varistor MOV3 and a second end of an mth discharge tube FDG M of the M discharge tubes is connected to ground.
The voltage dividing circuit 15 includes: resistor R1.
In this embodiment, a first end of the resistor R1 is connected to a first end of the first discharge tube FDG1, and a second end of the resistor R1 is connected to a second end of the mth discharge tube FDG M and to a ground line.
Further, as shown in fig. 3, the first terminal of the resistor R1 is further connected to the second terminal of the second varistor MOV2 and the second terminal of the third varistor MOV 3.
As shown in fig. 3, when the surge signal generated by a lightning strike on the L-line (live line)/N-line (neutral line) is a differential mode signal, the first varistor MOV1 is turned on and the voltage clamp of the differential mode signal is at the first clamping voltage. When the surge signal generated by the lightning strike on the L line/N line is a common-mode signal, if the common-mode signal is input from the L line, the third varistor MOV3 is conducted, the voltage clamp of the common-mode signal is positioned at the threshold voltage of the common-mode signal, and the first discharge tube FDG1 … … FDG M is conducted, so that the voltage remained after being absorbed by the third varistor MOV3 is quickly discharged to the ground, the residual voltage at the output end of the driving circuit is reduced, and the lightning strike residual voltage entering the load is further reduced. If a common-mode signal is input from an N line, the second piezoresistor MOV2 is conducted, a voltage clamp of the common-mode signal is positioned at the threshold voltage, the first discharge tube FDG1 … … FDG M is conducted, and the residual voltage absorbed by the second piezoresistor MOV2 is quickly discharged to the ground, so that the residual voltage at the output end of the driving circuit is reduced, the lightning residual voltage entering a load is effectively reduced, and the damage probability of the load is reduced.
In the insulation voltage withstand test, the L line and the N line are firstly shorted together, when the insulation voltage withstand test is started, the second varistor MOV2 and the third varistor MOV3 are connected in parallel, the resistor R1 and the second varistor MOV2 and the third varistor MOV3 which are connected in parallel form a series mode, at this time, the voltage at the input end passes through the second varistor MOV2 and the third varistor MOV3 which are connected in parallel, then passes through the resistor R1, finally reaches the ground, and further the voltage at the input end is divided through the resistor R1, because the resistors are connected in parallel at two ends of a series discharge tube group formed by M series discharge tubes, the voltage at the input end is divided through the resistor R1, so that two ends of the series discharge tube group also have impedance, and in order to ensure that the insulation voltage withstand test passes, the impedance of the resistor R1 needs to meet the condition of the formula (1).
At this time, the impedance across the series group of discharge tubes is equivalent to the impedance of the resistor R1, that is:
wherein Z isFDG.1……FDG MIs the impedance of the series bank of discharge tubes.
Because the impedance of the second varistor MOV2 and the third varistor MOV3 is above M omega, and the series discharge tube group FDG1 … … FDG M is in an off state (OPEN state), voltage division unevenness occurs during a withstand voltage test, all the voltage at the input end is applied to the series discharge tube group FDG1 … … FDG M, and when the specification of a discharge tube in the series discharge tube group FDG1 … … FDG M is less than or equal to 2KV, the series discharge tube group FDG is easily triggered, so that poor withstand voltage is caused. When we connect the resistor R1 in parallel to the series group FDG1 … … FDG M and the resistor R1 satisfies the condition (formula 3), the impedance of the series group FDG1 … … FDG M is also above M Ω, and at this time, when testing the withstand voltage, because the second varistor MOV2 and the third varistor MOV3 have impedance with the series group FDG1 … … FDG M, the voltage will be divided, and the voltage across the series group FDG1 … … FDG M is further:
VFDG1…FDGM＝Vin-VMOV2/MOV3＜Vtong (Chinese character of 'tong')(4 formula).
Wherein, VFDGVoltage, V, across the discharge tube FDG for withstand voltage testingTong (Chinese character of 'tong')The on-state voltage of the discharge tubes in the series-connected discharge tube group FDG1 … … FDGM. As can be seen from the formula (4), when the withstand voltage test is performed, the voltages at the two ends of the series discharge tube group FDG1 … … FDGM are smaller than the on-state voltages of the discharge tubes, so that the discharge in the series discharge tube group FDG1 … … FDGM cannot be triggered by mistake, the pass of the withstand voltage test is effectively ensured, and the withstand voltage test is good.
It should be noted that, in the voltage dividing circuit 15 of the first embodiment and the second embodiment, only one resistor is shown, and in practical applications, the voltage dividing circuit 15 may also be implemented by a plurality of resistors, that is, as described above, the present invention is not specifically exemplified.
Further, the discharge tubes used in the bleeder circuit 14 of the embodiment of the present invention are all gas discharge tubes, that is, one discharge tube used in fig. 2 and M discharge tubes used in fig. 3 are all gas discharge tubes.
The utility model discloses a surge and withstand voltage circuit are hit in lightning protection both can effectively restrain thunderbolt surge voltage and electric current, also can be through parallelly connected resistance that sets up in gas discharge tube's both ends to when making to carry out withstand voltage test, even adopt the gas discharge tube of small dimension, also can guarantee that withstand voltage tests is good, reached lightning surge protection and the equal satisfiable effect of withstand voltage test. In addition, the lightning surge and voltage withstand test circuit does not need to additionally increase the cost, and compared with the circuit which needs a high-specification gas discharge tube, the lightning surge and voltage withstand test circuit is lower in cost, can achieve a good lightning surge suppression effect, is good in voltage withstand test effect and high in reliability, and effectively reduces the damage probability of a driving circuit and an output end load.
Further, the utility model also provides a power, should include the embodiment of the utility model discloses surge and withstand voltage circuit are hit in lightning protection. Wherein, the utility model provides a power includes but not limited to the power of illumination lamps and lanterns (like LED drive power supply), industry class power, communication class power etc. hits surge and withstand voltage circuit can satisfy the effect that the surge was hit in order to guarantee the power through setting up this lightning protection in the power, can effectively restrain and absorb thunderbolt surge signal, also can satisfy withstand voltage test simultaneously, and withstand voltage test effect is fine moreover, can not have the bad problem of withstand voltage test. In addition, the lightning surge and insulation voltage resistant circuit does not need to increase extra cost, has high reliability, and can effectively reduce the residual voltage of the output end of the power supply and effectively reduce the damage probability of loads (such as lamps) when the power supply is struck by lightning.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A surge and withstand voltage protection circuit against lightning, comprising:
the first protection circuit is respectively connected with a live wire and a zero line and clamps surge signals generated by lightning strike at a first clamping voltage when the alternating current input end is struck by the lightning;
the second protection circuit is respectively connected with the live wire and the zero wire;
the bleeder circuit is connected with the second protection circuit, and the bleeder circuit is connected with the bleeder circuit in parallel;
the second protection circuit, the bleeder circuit and the bleeder circuit are in when the alternating current input end encounters lightning, the surge signal generated by the lightning stroke is discharged to the ground, and the bleeder circuit is in when the alternating current input end carries out withstand voltage test, the voltage input by the alternating current input end is divided, so that the impedance at the two ends of the bleeder circuit is the same as the impedance of the second protection circuit.
2. The lightning protection surge and withstand voltage circuit of claim 1, wherein the first protection circuit comprises: a first voltage dependent resistor;
the first end of the first piezoresistor is connected with the live wire, and the second end of the first piezoresistor is connected with the zero wire.
3. The lightning protection surge and withstand voltage circuit of claim 1, wherein the second protection circuit comprises: a second and a third piezo-resistor;
the first end of the second piezoresistor is connected with the zero line, the second end of the second piezoresistor is connected with the first end of the bleeder circuit, the first end of the third piezoresistor is connected with the live wire, and the second end of the third piezoresistor is connected with the first end of the bleeder circuit and the first end of the bleeder circuit.
4. The lightning protection surge and withstand voltage circuit of claim 3, wherein the bleed circuit comprises: a discharge tube;
the first end of the discharge tube is connected with the second end of the second voltage dependent resistor and the second end of the third voltage dependent resistor, and the second end of the discharge tube is connected with the ground wire.
5. The lightning protection surge and withstand voltage circuit of claim 4, wherein the bleed circuit comprises: m discharge tubes; m is an integer greater than 1;
the M discharge tubes are connected in series, a first end of a first discharge tube in the M discharge tubes is connected with a second end of the second voltage dependent resistor and a second end of the third voltage dependent resistor, and a second end of an Mth discharge tube in the M discharge tubes is connected with the ground wire.
6. The lightning protection surge and withstand voltage circuit of claim 5, wherein the voltage divider circuit comprises: a resistance;
a first end of the resistor is connected to a first end of the one discharge tube, and a second end of the resistor is connected to a second end of the one discharge tube and to the ground.
7. The lightning protection surge and withstand voltage circuit of claim 6, wherein a first end of the resistor is connected to a first end of the first discharge tube, and a second end of the resistor is connected to a second end of the Mth discharge tube and to the ground line.
8. The lightning protection surge and withstand voltage circuit of claim 6, wherein the resistance has an impedance that satisfies:
wherein Z isR1Is the impedance of a resistor, VinVoltage, V, input from AC input terminal for withstand voltage testMOV2/MOV3Is the voltage across the second or third varistor, IdMOV2Is the maximum leakage current of the second varistor, IdMOV3Is the maximum leakage current of the third varistor.
9. The lightning surge and withstand voltage circuit of claim 5, wherein the one and M discharge tubes are gas discharge tubes.
10. A power supply comprising the lightning surge protection and withstand voltage circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921558333.0U CN210608527U (en) | 2019-09-18 | 2019-09-18 | Lightning surge prevention and insulation voltage resistance circuit and power supply |
Applications Claiming Priority (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985238A (en) * | 2021-12-23 | 2022-01-28 | 极限人工智能有限公司 | Control circuit for withstand voltage and ESD test, withstand voltage test method and endoscope |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985238A (en) * | 2021-12-23 | 2022-01-28 | 极限人工智能有限公司 | Control circuit for withstand voltage and ESD test, withstand voltage test method and endoscope |
| CN113985238B (en) * | 2021-12-23 | 2022-03-11 | 极限人工智能有限公司 | Control circuit for withstand voltage and ESD test, withstand voltage test method and endoscope |
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Effective date of registration: 20210602 Address after: Building A3, Gonghe fourth industrial zone, Shajing street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN SOSEN ELECTRONICS Co.,Ltd. Address before: 657000 No.51 Boji village group, Luobu Town, Weixin County, Zhaotong City, Yunnan Province Patentee before: Wang Zhongyue |